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Male I Johann Click to view I Johann in the family tree

I was born about 1241.  I's father was Otto I "das Kind" and his mother was Margravine of Brandenburg Mathilde.  His paternal grandparents were Duke of Brunswick Wilhelm and Princess of Denmark Helene; his maternal grandparents were II Albrecht and Margravine of Lower Lusatia Mathilde. He had three brothers and six sisters, named Duke of Brunswick, Albrecht, Duke of Brunswick, Matilde, Duchess of Brunswick, Duchess of Brunswick, Duchess of Brunswick, Duchess of Brunswick-Lüneburg and Duchess of Brunswick-Lüneburg.  He was the fourth youngest of the ten children.

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